This term have 2 different meanings in the investing world. There are few of terms in the investing world which might have different meanings. But lets get into explaining what the term means.
The first meaning of this term is that it is a sustainable investment style which involves investing in companies that lead their peer groups with respect to sustainability performance.
And the second meaning of this term is basically a top performing product, service or even a person within a category or peer group.
Politics, Books and Me 